Crazy email question

In my set up every user has a unique slug.
Now on their profile i would like the option to cloak their address if they
choose to hide it so myname@atmyReal.com becomes slug@site.com which ends up
going to their real address.

Idea is like craigslist where their emails in ads are
543-hn567@craigslist.com
but when you send to that address it ends up going to whatever info the user
has on file email address.

Is there an easy way to do such a thing with cake? I know it's a weird
question, probably nothing to do with cake but I had to ask.

Thanks

Dave